Alien Pythons Kill Native Mammals

The growth of the Burmese python population in the Everglades, Florida, is being blamed for a reduction in the number of native mammals like rabbits and bobcats. Burmese pythons are not native to the Everglades and are believed to have been introduced over 30 years. They are now the top predator and have even been known to tackle alligators. The sightings of some animals like racoons have gone down over 99% since the snake's introduction.

http://www.bbc.co.uk/news/science-environment-16791094